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Broadband semiconductor superlattice detector for THz radiation

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7 Author(s)
Klappenberger, F. ; Institut für Angewandte Physik, Universität Regensburg, 93040 Regensburg, Germany ; Ignatov, A.A. ; Winnerl, S. ; Schomburg, E.
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We report on a broadband GaAs/AlAs superlattice detector for THz radiation; a THz field reduces the current through a superlattice, which is carried by miniband electrons, due to modulation of the Bloch oscillations of the miniband electrons. We studied the detector response, by use of a free electron laser, in a large frequency range (5–12 THz). The responsivity showed strong minima at frequencies of infrared active phonons of the superlattice. A theoretical analysis of the detector delivers an understanding of the role of phonons and gives a characterization of the responsivity. © 2001 American Institute of Physics.

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Applied Physics Letters  (Volume:78 ,  Issue: 12 )